import type { FormatDistanceFn, FormatDistanceLocale } from "../../../types.ts";

type FormatDistanceTokenValue =
  | string
  | {
      one: string;
      other: string;
    };

const formatDistanceLocale: FormatDistanceLocale<FormatDistanceTokenValue> = {
  lessThanXSeconds: {
    one: "少於 1 秒",
    other: "少於 {{count}} 秒",
  },

  xSeconds: {
    one: "1 秒",
    other: "{{count}} 秒",
  },

  halfAMinute: "半分鐘",

  lessThanXMinutes: {
    one: "少於 1 分鐘",
    other: "少於 {{count}} 分鐘",
  },

  xMinutes: {
    one: "1 分鐘",
    other: "{{count}} 分鐘",
  },

  xHours: {
    one: "1 小時",
    other: "{{count}} 小時",
  },

  aboutXHours: {
    one: "大約 1 小時",
    other: "大約 {{count}} 小時",
  },

  xDays: {
    one: "1 天",
    other: "{{count}} 天",
  },

  aboutXWeeks: {
    one: "大約 1 個星期",
    other: "大約 {{count}} 個星期",
  },

  xWeeks: {
    one: "1 個星期",
    other: "{{count}} 個星期",
  },

  aboutXMonths: {
    one: "大約 1 個月",
    other: "大約 {{count}} 個月",
  },

  xMonths: {
    one: "1 個月",
    other: "{{count}} 個月",
  },

  aboutXYears: {
    one: "大約 1 年",
    other: "大約 {{count}} 年",
  },

  xYears: {
    one: "1 年",
    other: "{{count}} 年",
  },

  overXYears: {
    one: "超過 1 年",
    other: "超過 {{count}} 年",
  },

  almostXYears: {
    one: "將近 1 年",
    other: "將近 {{count}} 年",
  },
};

export const formatDistance: FormatDistanceFn = (token, count, options) => {
  let result;

  const tokenValue = formatDistanceLocale[token];
  if (typeof tokenValue === "string") {
    result = tokenValue;
  } else if (count === 1) {
    result = tokenValue.one;
  } else {
    result = tokenValue.other.replace("{{count}}", String(count));
  }

  if (options?.addSuffix) {
    if (options.comparison && options.comparison > 0) {
      return result + "內";
    } else {
      return result + "前";
    }
  }

  return result;
};
